[Lazarus] Building documentation

[Hans-Peter Diettrich]

The fpdoc project feature simplifies the maintenance and building of the 
docmentation considerably. I've just uploaded an patch (#20787) with 
fpdoc projects for building the documentation for the LCL and LazUtils 
packages. Projects for building the RTL and FCL documentation are 
available on demand.

Some notes:

The latest (trunk) version of fpdoc is required, it contains a couple of 
updates which are missing in the release versions. Some more flaws shall 
be fixed soon, hopefully.

The project files must reside in the proper directory, because they 
contain relative references to the PAS and XML files. I found it 
convenient to use a user-specific filename prefix, e.g. "my", so that 
logfiles etc. can be found easily in a directory listing or file open 
dialog.

The projects assume that all FPC and Lazarus documentation resides in a 
common directory, the supplied projects assume \AllDocs\. Any better ideas?
Most options (except booleans) can be overridden by commandline 
arguments, e.g.
 > fpdoc --project=mylcl --format=chm


For documentation writers docs\html\mkhtml.bat has been supplied, which 
allows to build the documentation for a single LCL unit. Usage:
 > mkhtml <unit> <extension>
e.g.
 > mkhtml controls pp
The build log goes into <unit>-log.txt, the HTML files into test\.

Any comments?

DoDi